Pulsation-free wet spraying machine

ABSTRACT

A pulsation-free wet spraying machine resolves the issue of pulsing during pumping of a concrete spraying machine The wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism and a distribution valve. The hopper of the pumping mechanism is disposed above the material chamber. The distribution valve is disposed inside the material chamber, the concrete feeding mechanism and the auxiliary feeding mechanism both include a hydraulic cylinder, a concrete piston and a concrete cylinder, a discharge pipe is a three-way pipe fixed at a side surface of the material chamber, an auxiliary discharge pipe of the discharge pipe is connected with an auxiliary concrete cylinder, and a through hole is disposed on the auxiliary concrete cylinder. The swing mechanism includes a swing hydraulic cylinder, a swing arm and a swing hydraulic cylinder base, an auxiliary piston rod of the auxiliary feeding mechanism passes through a mandrel to push an auxiliary concrete piston to move inside the auxiliary concrete cylinder. In addition, the pulsation-free wet spraying machine stably feeds a material, has a compact structure, and is wear-resistant.

TECHNICAL FIELD

The present disclosure relates to the technical field of engineering equipment, and in particular to a pulsation-free wet spraying machine.

BACKGROUND

Concrete wet spraying machines are widely applied to locations such as coal mine roadways and road tunnels requiring concrete spraying supporting. The common concrete wet spraying machine is a plunger-type concrete wet spraying machine that works as follows: pumping is realized by switching a distribution valve. In a pumping process, a pulsation phenomenon may be caused due to swing of the distribution valve, thereby increasing a pipe blocking probability in the pumping process and leading to a rebound problem in a spraying process.

SUMMARY

To solve the pulsation problem and the sprayed concrete rebound problem of the concrete wet spraying machine in a working process, the present disclosure provides a pulsation-free wet spraying machine. A specific technical solution is described below.

A pulsation-free wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, where the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism, a distribution valve and a discharge pipe, the hopper is disposed above the material chamber, the concrete feeding mechanism includes two main hydraulic cylinders, two concrete pistons and two concrete cylinders, the auxiliary feeding mechanism includes an auxiliary hydraulic cylinder, an auxiliary concrete piston and an auxiliary concrete cylinder, and the concrete cylinder of the concrete feeding mechanism is in communication with the material chamber; the distribution valve is disposed inside the material chamber and in communication with the concrete cylinder and the discharge pipe; the discharge pipe is disposed on the material chamber and is a three-way pipe including an auxiliary discharge pipe and a main discharge pipe, the auxiliary discharge pipe is connected with the auxiliary concrete cylinder, an air hole is disposed on the auxiliary concrete cylinder, and an auxiliary piston rod of the auxiliary feeding mechanism passes through a mandrel to push the auxiliary concrete piston to move inside the auxiliary concrete cylinder; the swing mechanism includes a swing hydraulic cylinder, a swing arm and a swing hydraulic cylinder base, the swing hydraulic cylinder base is mounted at an outer side of the material chamber, the swing hydraulic cylinders are symmetrically arranged at both sides of the swing hydraulic cylinder base, and the swing arm is hinged with the swing hydraulic cylinder; the swing arm is mounted through a spline in cooperation with the mandrel; the hydraulic system include a hydraulic oil tank and a motor, and the pumping mechanism, the swing mechanism and the hydraulic system are all disposed on the frame.

Preferably, a concrete piston is disposed at an end of a hydraulic cylinder piston rod of the concrete feeding mechanism and moves inside the concrete cylinder; an auxiliary concrete piston is disposed at an end of the auxiliary piston rod of the auxiliary feeding mechanism and moves inside the auxiliary concrete cylinder.

Preferably, the material chamber is disposed below the hopper and communicates with the hopper, the two main hydraulic cylinders of the concrete feeding mechanism are disposed in parallel at a side surface of the material chamber, the main hydraulic cylinder is mounted on a water rinsing bath, and the auxiliary hydraulic cylinder is mounted above the hydraulic cylinder.

Preferably, a distribution valve, a front friction plate, a rear friction plate, a distribution valve friction plate, a rubber spring and a sealing ring are disposed within the material chamber, the front friction plate is disposed at a front end of the distribution valve, the distribution valve friction plate is disposed at a rear end of the distribution valve, the rubber spring is disposed between the distribution valve friction plate and the distribution valve, and the sealing ring is disposed between the distribution valve and the front friction plate.

Preferably, one through-hole is disposed on the front friction plate, and two through-holes are disposed on the rear friction plate.

Preferably, the mandrel is square in the middle and circular at both ends, the mandrel is mounted through a mandrel cover in cooperation with a fitting slot at an upper part of the distribution valve, and the mandrel cover is fixed with nuts; the distribution valve swings along with the mandrel.

Preferably, the concrete piston of the concrete feeding mechanism retracts in the concrete cylinder to suck a material into the concrete cylinder, and the piston rod pushes the concrete piston to push the material out of the concrete cylinder so as to transport the material to the discharge pipe through the distribution valve; when the concrete feeding mechanism pushes the material, the auxiliary concrete piston of the auxiliary feeding mechanism retracts in the auxiliary concrete cylinder to suck a material from the auxiliary discharge pipe so that the material n the auxiliary concrete cylinder is pushed to the discharge pipe when the distributing valve swings.

Preferably, when the auxiliary concrete piston in the auxiliary concrete cylinder pushes the material, baffle plates at both wings of the distribution valve friction plate block outlets of two concrete cylinders.

The present disclosure has following beneficial effects: the pumping pulsation problem caused by the swing of the distribution valve in a pumping process is solved by disposing the auxiliary feeding mechanism, thereby reducing the pipe blocking probability in the pumping process; a lower end of the hopper is connected with the material chamber so that the material flows into the material chamber due to its weight; the discharge pipe is disposed as a three-way pipe to help the auxiliary concrete piston to retract during a pumping process of the concrete feeding mechanism to suck a part of material into the auxiliary concrete cylinder; during the swinging process of the distribution valve, the auxiliary concrete piston in the auxiliary concrete cylinder pushes the sucked material for compensation, thereby avoiding the pumping pulsation phenomenon and preventing the sprayed concrete rebound problem; the auxiliary discharge pipe is connected with the auxiliary concrete cylinder which is provided with the air hole at a side connecting with the material chamber, thereby avoiding the problem that the auxiliary concrete piston cannot retract due to excessive air pressure resulted from compressed air; friction plates are disposed at the front and rear ends of the distribution valve respectively, and the front friction plate and the distribution valve friction plate each are made of hard alloy, thereby strengthening sealing, preventing quick wear caused by the swing of the distribution valve, and prolonging the service life of equipment; the rubber spring is disposed between the distribution valve friction plate and the distribution valve to ensure the distribution valve friction plate and the rear friction plate are in close contact, thus strengthening sealing; the swing arm is mounted through the spline in cooperation with the mandrel, and the mandrel is mounted through the mandrel cover in cooperation with the fitting slot at the upper part of the distribution valve to enable the mandrel to swing effectively along with the swing arm.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram illustrating an overall structure of a pulsation-free wet spraying machine according to an example of the present disclosure.

FIG. 2 is a schematic diagram illustrating mounting structures of a pumping mechanism and a swing mechanism according to an example of the present disclosure.

FIG. 3 is a schematic diagram illustrating partial structures of a pumping mechanism and a swing mechanism according to an example of the present disclosure.

FIG. 4 is a sectional schematic diagram illustrating structures of a pumping mechanism and a swing mechanism according to an example of the present disclosure.

FIG. 5 is a schematic diagram illustrating a swing mechanism according to an example of the present disclosure.

FIG. 6 is a mounting schematic diagram illustrating a distribution valve according to an example of the present disclosure.

FIG. 7 is a schematic diagram illustrating a swing structure of a distribution valve according to an example of the present disclosure.

FIG. 8 is a structural schematic diagram illustrating a rear friction plate of a distribution valve according to an example of the present disclosure.

FIG. 9 is a structural schematic diagram illustrating a distribution valve friction plate according to an example of the present disclosure.

FIG. 10 is a structural schematic diagram illustrating a front friction plate of a distribution valve according to an example of the present disclosure.

FIG. 11 is a structural schematic diagram illustrating a discharge pipe according to an example of the present disclosure.

Numerals of the drawings are described as follows: 1—frame, 2—pumping mechanism, 3—swing mechanism, 4—hydraulic system, 21—hopper, 22—material chamber, 222—front friction plate, 223—rear friction plate, 224—distribution valve friction plate, 225—rubber spring, 226—sealing ring, 23—concrete feeding mechanism, 231—concrete piston, 232—piston rod, 233—concrete cylinder, 234—main hydraulic cylinder, 24—auxiliary feeding mechanism, 241—auxiliary concrete piston, 242—auxiliary piston rod, 243—auxiliary concrete cylinder, 244—auxiliary hydraulic cylinder, 25—discharge pipe, 251—air hole, 252—auxiliary discharge pipe, 253—main discharge pipe, 26—distribution valve, 27—water rinsing bath, 271—pulling rod, 31—swing hydraulic cylinder, 32—swing arm, 33—swing hydraulic cylinder base, 34—mandrel, and 35—mandrel cover.

DETAILED DESCRIPTION OF THE EMBODIMENTS

As shown in FIGS. 1-11, a specific implementation of a pulsation-free wet spraying machine according to the present disclosure is described below.

Specifically, the pulsation-free wet spraying machine includes a frame 1, a pumping mechanism 2, a swing mechanism 3 and a hydraulic system 4. Wheels are disposed on the frame 1 to facilitate movement of the wet spraying machine; the hydraulic system 4 includes a hydraulic oil tank and a motor, the hydraulic oil tank is disposed at an upper part of the frame, the motor and the hydraulic oil tank drive hydraulic cylinders of the swing mechanism 3 and the pumping mechanism 2 to work, and thus, the structure outputs stable power safely and reliably; the swing mechanism 3 and the pumping mechanism 2 are mounted cooperatively, a concrete feeding mechanism of the pumping mechanism 2 is disposed at the bottom of the frame, and a hopper 21 of the pumping mechanism 2 is disposed at an upper front part of the frame. In this case, the pumping mechanism 2 realizes material pumping, and the swing mechanism 3 brings a mandrel 34 and a distribution valve 26 to swing through a swing arm 32.

The pumping mechanism 2 includes a hopper 21, a material chamber 22, a concrete feeding mechanism 23, an auxiliary feeding mechanism 24, a distribution valve 26, a water rinsing bath 27 and a discharge pipe 25. A lower end of the hopper 21 is connected with the material chamber 22. The concrete feeding mechanism 23 includes two main hydraulic cylinders 234, two concrete pistons 231 and two concrete cylinders 233, the auxiliary feeding mechanism 24 includes an auxiliary hydraulic cylinder 244, an auxiliary concrete piston 241 and an auxiliary concrete cylinder 243, and the concrete cylinder 233 of the concrete feeding mechanism 23 is in communication with the material chamber 22. The water rinsing bath 27 and the material chamber 22 are arranged in parallel, a pulling rod 271 is disposed between the water rinsing bath 27 and the material chamber 22, and three through-holes are disposed on the water rinsing bath 27 to facilitate mounting. The distribution valve 26 is disposed inside the material chamber 22 and in communication with the concrete cylinder 233 of the concrete feeding mechanism and the discharge pipe 25. The concrete piston 231 is disposed at an end of a piston rod 232 of the concrete feeding mechanism 23 and moves inside the concrete cylinder 233; the auxiliary concrete piston 241 is disposed at an end of an auxiliary piston rod 242 of the auxiliary feeding mechanism 24 and moves inside the auxiliary concrete cylinder 243. The concrete feeding mechanism 23 pumps a material through operation of two main hydraulic cylinders 234 in cooperation with the disposed auxiliary feeding mechanism 24, thereby solving the pumping pulsation problem caused by caused by the swing of the distribution valve 26 in a pumping process of the concrete feeding mechanism 23. The hopper 21 is mounted above the material chamber 22, two concrete cylinders 233 of the concrete feeding mechanism 23 are symmetrically arranged at a side surface of the material chamber 22, the water rinsing bath 27 is mounted at a rear side of the concrete feeding mechanism 23, and the auxiliary feeding mechanism 24 is mounted above the concrete feeding mechanism 23. A distribution valve 26, a front friction plate 222, a rear friction plate 223, a distribution valve friction plate 224, a rubber spring 225 and a sealing ring 226 are disposed within the material chamber 22, the front friction plate 222 is disposed at a front end of the distribution valve 26, and the distribution valve friction plate 224 is disposed at a rear end of the distribution valve 26, where the front end of the distribution valve is an end connecting the distribution valve 26 with the discharge pipe 25, and the rear end of the distribution valve is an end connecting the distribution valve 26 with the concrete cylinder 233. The rubber spring 225 is disposed between the distribution valve friction plate 224 and the distribution valve 26 to enable the distribution valve friction plate and the rear friction plate to be in close contact, thereby strengthening sealing. Further, a through-hole having a circular hole diameter slightly larger than or equal to the concrete cylinder 233 is disposed on the distribution valve friction plate 224, and baffle plates are disposed at both wings of the through-hole; when the through-hole of the distribution valve friction plate 224 is rotated to be between two concrete cylinders 233, the baffle plates at the both wings block outlets of the concrete cylinders 233. The sealing ring 226 is disposed between the distribution valve 26 and the front friction plate 222 to seal up a pumping space. The discharge pipe 25 is disposed on the material chamber 22 and is a three-way pipe including an auxiliary discharge pipe 252 and a main discharge pipe 253, the auxiliary discharge pipe 253 is connected with the auxiliary concrete cylinder 243 on which an air hole 251 is disposed, and the auxiliary piston rod 242 passes through the mandrel 34 to push the auxiliary concrete piston 241 to move inside the auxiliary concrete cylinder 243. Therefore, the problem that the auxiliary concrete piston 241 cannot retract due to the excessive air pressure is avoided.

The swing mechanism 3 includes a swing hydraulic cylinder 31, a swing arm 32, a mandrel 34 and a swing hydraulic cylinder base 33. The swing hydraulic cylinder base 33 is mounted at an outer side of the material chamber 22, the swing hydraulic cylinders 31 are symmetrically arranged at both sides of the swing hydraulic cylinder base, and the swing arm 32 is hinged with the swing hydraulic cylinders 31 and the wing arm 32 is mounted through a spline in cooperation with the mandrel 34. The swing hydraulic cylinder base 33 is in a trapezoidal shape, the swing arm 32 is mounted at a short-side position of the hydraulic cylinder base, and two swing hydraulic cylinders 31 are arranged at two inclined sides of the swing hydraulic cylinder base 33 respectively. During work, when one of the two swing hydraulic cylinders 31 extends, the other retracts. The work is repeated in such a way that the mandrel 34 is driven to swing so as to drive the distribution valve 26 to swing. The mandrel 34 is square in the middle and circular at both ends, the mandrel 34 is mounted through a mandrel cover 35 in cooperation with a fitting slot at the upper part of the distribution valve 26, and the mandrel cover 35 is fixed with nuts. The distribution valve 26 swings along with the mandrel 34, and the auxiliary piston rod 242 of the auxiliary feeding mechanism 24 passes through the mandrel 34. The hydraulic system 4 includes a hydraulic oil tank and a motor, and the pumping mechanism 2, the swing mechanism 3 and the hydraulic system 4 are all disposed on the frame 1.

The above pulsation-free wet spraying machine specifically works in the following process: firstly, material is poured into the hopper 21 and then flows into the material chamber 22 through the hopper 21, where the concrete piston 231 inside the concrete cylinder 233 of one concrete feeding mechanism 23 retracts to enable the concrete cylinder 233 to suck the material from the material chamber 22, and the other concrete feeding mechanism 23 pressurizes and pushes the material in the concrete cylinder 233 through the concrete piston 231, so that the material reaches the discharge pipe 25 through the distribution valve 26; the distribution valve 26 swings along with the mandrel 34, the concrete piston 231 of the concrete feeding mechanism 23 completing pumping retracts at this time to enable the corresponding concrete cylinder 233 to suck material from the material chamber 22, and the concrete piston 231 of the concrete feeding mechanism completing material sucking pushes the previously sucked material. In this way, the concrete feeding mechanism repeats the above work. In this process, when any one concrete feeding mechanism pumps the material, the auxiliary concrete piston 241 in the auxiliary concrete cylinder 243 connected with the discharge pipe 25 retracts to enable the auxiliary concrete cylinder 243 to suck the material from the auxiliary discharge pipe 253; when the distribution valve 26 swings, the auxiliary piston rod 242 of the auxiliary feeding mechanism 24 pushes the auxiliary concrete piston 241 to complete feeding. Further, as shown in FIG. 7, when the auxiliary feeding mechanism 24 pumps the material, the baffle plates at both wings of the distribution valve friction plate 224 block the outlets of the concrete cylinders 233 to ensure stable feeding. Therefore, the pumping pulsation phenomenon is avoided.

Of course, the above descriptions are not intended to limit the present disclosure, and the present disclosure also is not limited to the above examples. Variations, modifications, additions or substitutions made by persons skilled in the art within the substantive scope of the present disclosure shall also belong to the scope of protection of the present disclosure. 

1. A pulsation-free wet spraying machine, comprising a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism comprises a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism, a distribution valve and a discharge pipe, the hopper is disposed above the material chamber, the concrete feeding mechanism comprises two main hydraulic cylinders, two concrete pistons and two concrete cylinders, the auxiliary feeding mechanism comprises an auxiliary hydraulic cylinder, an auxiliary concrete piston and an auxiliary concrete cylinder, and the concrete cylinder of the concrete feeding mechanism is in communication with the material chamber; the distribution valve is disposed inside the material chamber and in communication with the concrete cylinders and the discharge pipe; and the distribution valve friction plate is connected with the distribution valve; the discharge pipe is disposed on the material chamber, the discharge pipe is a three-way pipe comprising an auxiliary discharge pipe and a main discharge pipe, the auxiliary discharge pipe is connected with the auxiliary concrete cylinder on which an air hole is disposed, and an auxiliary piston rod of the auxiliary feeding mechanism passes through a mandrel to push the auxiliary concrete piston to move inside the auxiliary concrete cylinder; the swing mechanism comprises a swing hydraulic cylinder, a swing arm and a swing hydraulic cylinder base, the swing hydraulic cylinder base is mounted at an outer side of the material chamber, the swing hydraulic cylinders are symmetrically arranged at both sides of the swing hydraulic cylinder base, and the swing arm is hinged with the swing hydraulic cylinders; the swing arm is mounted through a spline in cooperation with the mandrel; the motor/hydraulic system comprises a hydraulic oil tank and a motor, and the pumping mechanism, the swing mechanism and the hydraulic system are all disposed on the frame; the concrete piston of the concrete feeding mechanism retracts inside the concrete cylinder to suck material into the concrete cylinder, and the piston rod pushes the concrete piston to push the material out of the concrete cylinder and transport the material to the discharge pipe through the distribution valve; when the concrete feeding mechanism pushes the material, the auxiliary concrete piston of the auxiliary feeding mechanism retracts inside the auxiliary concrete cylinder to help suck the material from the auxiliary discharge pipe, so that the material in the auxiliary concrete cylinder is pushed to the discharge pipe when the distribution valve swings; the auxiliary concrete piston in the auxiliary concrete cylinder pushes the material, baffle plates at both wings of the distribution valve friction plate block outlets of two concrete cylinders.
 2. The pulsation-free wet spraying machine according to claim 1, wherein the concrete piston is disposed at an end of a hydraulic cylinder piston rod of the concrete feeding mechanism and moves inside the concrete cylinder; the auxiliary concrete piston is disposed at an end of the auxiliary piston rod of the auxiliary feeding mechanism and moves inside the auxiliary concrete cylinder.
 3. The pulsation-free wet spraying machine according to claim 1, wherein the material chamber is disposed below the hopper and in communication with the hopper, two main hydraulic cylinders of the concrete feeding mechanism are arranged in parallel at side surface of the material chamber, the main hydraulic cylinders are mounted on a water rinsing bath, and the auxiliary hydraulic cylinder is mounted above the main hydraulic cylinders.
 4. The pulsation-free wet spraying machine according to claim 1, wherein a distribution valve, a front friction plate, a rear friction plate, a distribution valve friction plate, a rubber spring and a sealing ring are disposed inside the material chamber, the front friction plate is disposed at a front end of the distribution valve, the distribution valve friction plate is disposed at a rear end of the distribution valve, the rubber spring is disposed between the distribution valve friction plate and the distribution valve, and the sealing ring is disposed between the distribution valve and the front friction plate; and the distribution valve friction plate and the rear friction plate are in close contact.
 5. The pulsation-free wet spraying machine according to claim 4, wherein one through-hole is disposed on the front friction plate, and two through-holes are disposed on the rear friction plate.
 6. The pulsation-free wet spraying machine according to claim 1, wherein the mandrel is square in the middle and circular at both ends, the mandrel is mounted through a mandrel cover in cooperation with a fitting slot at an upper part of the distribution valve, and the mandrel cover is fixed with nuts; the distribution valve swings along with the mandrel.
 7. (canceled)
 8. (canceled) 